City of Tucson

Standards Manual for Drainage Design and Floodplain Management in Tucson, Arizona

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Other manuals in Arizona: City of Phoenix, Pima County

Document Metadata

Jurisdiction level

municipality

“City of Tucson Department of Transportation, Engineering Division”
Title Page

State

Arizona

“STANDARDS MANUAL FOR DRAINAGE DESIGN AND FLOODPLAIN MANAGEMENT IN TUCSON, ARIZONA”
Title Page

Version / edition

December 1989 (Revised July 1998); Chapter IV revised April 1998

“DECEMBER, 1989 (REVISED JULY, 1998)”
Title Page

Adoption / effective date

1989-12

“DECEMBER, 1989”
Title Page

Last revised date

1998-07

“REVISED JULY, 1998... CHAPTER IV: CITY OF TUCSON METHOD FOR ESTIMATING FLOOD PEAKS AND FLOOD HYDROGRAPHS (REVISED APRIL, 1998)”
Title Page; Chapter IV

Relationship to state manual

independent

“STANDARDS MANUAL FOR DRAINAGE DESIGN AND FLOODPLAIN MANAGEMENT IN TUCSON, ARIZONA... Prepared for City of Tucson”
Title Page

Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year, 25-year, 50-year, 100-year

“procedure for estimating 2-year, 5-year, 10-year, 25-year, 50-year, and 100-year flood peaks and flood hydrographs for watershed areas located within the City of Tucson”
Chapter IV, Section 4.1

Water quality volume method

Threshold Retention required in Balanced/Critical Basins per the Stormwater Detention/Retention Manual; Critical Basins require a 15% reduction of the 2-, 10-, and 100-year events. Stormwater harvesting may offset Threshold Retention volume (Design Policy #10).

“Compliance with these Threshold Retention requirements, which are described in the Stormwater Detention/Retention Manual, is now required... The volume utilized for stormwater harvesting may be used to offset the volume required for Threshold Retention. Stormwater harvesting has been added as Design Policy #10 in Chapter XIV”
October 24, 1997 Cover Letter

Peak flow calculation method(s)

City of Tucson Flood Peak Estimator Procedure (basins ≤10 sq mi), Tucson Stormwater Management Study (TSMS) hydrology (preferred where available), HEC-1, Rational Formula

“The City of Tucson Flood Peak Estimator Procedure shall be used to determine the design 100-year flood peak for drainage basins less than ten square miles in size.”
Chapter I, Design Policies — Chapter IV

Required hydrologic/hydraulic software

Stormwater System Planner (HEC-1 / AutoCAD mapping component for TSMS)

“The TSMS hydrologic modeling was accomplished using the Stormwater System Planner, a software package which includes a database manager, the HEC-1 hydrologic model, and an AutoCAD mapping component.”
Conditions of Use, TSMS Hydrologic Data

Approved BMP categories

Detention/Retention Basins, Stormwater Harvesting, Stormwater-Infiltration Systems (Dry Wells), Open Channels, Channel Stabilization and Hydraulic Structures, Storm Drains, Culverts, Street and Parking Lot Drainage

“CHAPTER VIII. OPEN-CHANNEL DESIGN... CHAPTER IX: Channel Stabilization and Hydraulic Structures... CHAPTER X: Storm Drains... CHAPTER XI: Culverts... CHAPTER XII: Street and Parking Lot Drainage... CHAPTER XIV. DETENTION/RETENTION BASINS... 14.5 Stormwater-Infiltration Systems”
Table of Contents